JPH0620326B2 - Switchgear - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pullout type switchgear, and more particularly to an insulating shutter mechanism for preventing accidental contact with a terminal stub when pulling out a switch.

When installing a horizontal pull-out circuit breaker or the like in a cell or housing, the busbars and terminal stubs rarely come into contact with workers. However, when the circuit breaker is pulled out from the cell or the housing, the bus bar and the terminal stub are exposed, and there is a risk of accidentally contacting the bus bar and the terminal stub during inspection or maintenance work. For example, U.S. Pat. No. 3,096,131; 3,113,820;
See Nos. 3,170,092; and 3,840,785.

The gist of the present invention is to provide a cell, a plurality of fixed terminal stubs arranged in the cell, which are spaced apart from each other, and terminal means that is removably arranged in the cell and releasably engages with the terminal stub when entering or leaving the cell. A barrier made of an electrically insulating material including a first shutter having an opening means for receiving the stub and a first shutter, and the first shutter laterally movable between an unaligned position and an aligned position of the opening means with respect to the stub. And a support means including a link that is biased to a non-aligned position and that is retractably provided in the shutter movement passage to prevent movement of the shutter from the non-aligned position. Allows the opening means to align with the stub by releasing the blocking means to retract the blocking means from the shutter travel passage once it has entered the cell Rutotomoni includes trigger means for enabling the connection between the terminal unit and the corresponding stub, said barrier,
It further includes a second shutter adjacent the first shutter and having a hole aligned with the stub, the second shutter being biased away from the stub and on a side of the first shutter remote from the stub. And wherein the link includes roller means penetrating an opening means provided in the first shutter, the unit retracting the second shutter and the first shutter laterally as the unit enters the cell. In the opening / closing device, the roller means is in rolling contact with the second shutter so that the opening means is aligned with the stub to expose the stub to the terminal means.

An advantage of the present invention is that a safety shutter which is actuated by movement of the circuit breaker and does not take up more space than is normally required to insulate the circuit breaker can occupy the active position when the circuit breaker is in the test position. .

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown, the pulling switch 5 comprises a circuit breaker 7 and a cell or housing 9. The circuit breaker is similar in construction and operation to that disclosed in U.S. Pat. No. 3,483,338. The circuit breaker 7 is housed in a molded case made of high-strength phenol resin such as reinforced glass fiber. Movable terminal means or terminals 11, 13 (FIG. 1) project from the rear wall of the circuit breaker. On the other hand, fixed terminal means or stubs 15, 17 penetrate the rear wall 19 of the cell 9 and connect to a bus bar (not shown) located to the right of this rear wall as seen in FIG. The electric circuit passing through the switchgear 5 starts from the stub 15 and reaches the terminal 11 through the terminal 11, the circuit breaker 7, and further reaches the stub 17.

The cell 9 comprises side walls 21, 23, a rear wall 19, and a front opening 25.

The circuit breaker 7 comprises a front panel 27 which closes the front opening 25 when it occupies the working or connecting position (Fig. 1). Frame members 29 and 31 (FIG. 8) for supporting the circuit breaker 7 are attached to both sides of the cell 9. To this end (FIGS. 4, 5, and 6), each frame member includes slots 33 for supporting wheels or rollers 35, 37 mounted on mandrels or pins 39 projecting from the sides of the circuit breaker. Each frame member 29, 31 includes a bracket 41 mounted to the frame by spacer bolts 43 so as to be spaced therefrom.

A telescopic track 45 is attached to each frame member 29, 31 and held by a corresponding bracket 41. Each bracket 41 includes a longitudinal slot 47 into which a retaining pin 49 on the track is inserted. Also attached to the frame member is a support bearing 51 which supports the telescopic track in the fully extended state (Fig. 3).
When the breaker 7 reaches the fully inserted position, that is, the connection position (FIG. 1), the telescopic track 45 is pulled back to the retracted position.

When the circuit breaker 7 is withdrawn from the cell 9 from the position of FIG. 1 to the position of FIG. 2, the rollers 35, 37 project a telescopic track or track extension, for example an upward lip or projection 55. Slot 3 until engaging means
The inside of 3 is moved to the left along the support surface 53. When the unit or circuit breaker 7 is further pulled out, the telescopic track moves together with the circuit breaker by the force of the roller 35 acting on the protrusion 55, and in this case, the track is supported by the support bearing 51 provided on the frame member 31. When the circuit breaker or unit 7 is pulled out from the position shown in FIG. 2 to the position shown in FIG. 3, the rollers 35 and 37 move from the supporting surface 53 to the surface 57 of the track 45.
And the circuit breaker is supported only on this surface 57. Third
As is apparent from the figure, the track 45 has a support bearing 51.
And the pin 4 located in the slot 47 of the bracket 41
Held by 9 and.

When the circuit breaker 7 is returned from the completely pulled-out position (FIG. 3) to the connected or operated position (FIG. 1), the rollers 35 and 37 have their panel surfaces 59 abut against the outer ends 61 of the tracks 45 so that the tracks are frame members. Position between 31 and bracket 41 (4th
(FIG. 7 to FIG. 7) until the vehicle is retracted along the surface 57 of the track 45. When the retracting position (FIG. 3) continues further, the roller 37 moves to the slot 33 and is supported up to the supporting surface 53.

As indicated by the arrow 63 in FIG. 3, the support surface 53 is slightly higher (approximately 0.031 inches) than the track surface 57, so that as the breaker enters the cell 9, the roller 37, and then the roller 35, slope 65. The load of the circuit breaker is transferred from the telescopic track 45 to the frame member 31. Then, the roller moves in the slot 33 until the terminals 11 and 13 reach the connection position (FIG. 1) where the terminals 11 and 13 are connected to the stubs 15 and 17, respectively.

A lever mechanism 67 for surely moving the circuit breaker 7 to a position where the terminals 11 and 13 are connected to the stubs 15 and 17 is provided. The mechanism 67 includes an operating shaft 69 and a cam attached to this shaft.
It includes a lever 71 and a cam pin 73. When the circuit breaker 7 is returned into the cell, the cam pin 73 enters the slot 33 until it reaches the right end of the slot where the upward engaging portion 75 is located. Then, when the operation shaft 69 is rotated manually, for example, via a lever (not shown), the cam lever 71 rotates in the counterclockwise direction to cause the pin 73 to enter the engaging portion 75 of the slot, and the pin 73 engages with the engaging portion. 75 slot surface 75a (first
Engagement with (as shown) moves the terminals 11, 13 and the stubs 15, 17 into correct electrical contact with each other and locks in this state.

In addition to the terminals 11 and 13 and the terminal stubs 15 and 17, a second connector or a contact 77 is retractably attached to the cell side walls 21 and 23, while the second connector 77 is retractably engaged with the outside of the circuit breaker 7. A second terminal or contact terminal 79 is provided. Therefore, the second connector 77,
It is attached to a retractable means consisting of a mounting bracket 81, a guide pin 83 attached to the bracket, and a coil spring 85. The second terminal 79 comprises a plurality of terminals 87 that enter into corresponding sockets formed on the second connector 77 in the intermediate or test position. Second
A conductor wire extends in a normal manner from each of the connector 77 and the second terminal as a starting point.

When the circuit breaker 7 enters the cell 9, the circuit breaker 7 reaches the connecting position via the disconnecting position, the intermediate position or the test position. At the disconnection position (Fig. 3), the terminals 11 and 13 are the stub 1
5 and 17, the connection with the second connector 77 and the second
The terminals are disengaged from each other. In the middle or test position (FIG. 1A), the second connector 77 and the second terminal 79 are
, But the terminals 11, 13 and the stubs 15, 17 are in the disengaged state. Finally, the circuit breaker is
In the figure, the terminals and the stubs 11 to 17 are connected to each other, and the second connector and the terminals 77 and 79 are also connected to each other.

To prevent accidental contact with the fixed terminal means or stub 15 when retracting the breaker 7 from the stub, a barrier 89 (FIG. 8) is associated with the above configuration. Barrier 89 comprises a pair of overlapping shutters including a pivotal shutter 91 and a sliding shutter 93. Both shutters,
It consists of an electrically insulating material such as high strength phenolic resin. Pivot shutter 91 (FIG. 7) comprises four similar holes 95 for receiving stubs 15. The sliding shutter 93 (FIG. 10) has a plurality of, for example, six openings 97.
And these openings 97 through the holes 9 of the pivotal shutter 91.
When aligned with 5, terminals 11 and 13 can push barrier 89 to the right in FIG. 8 until terminal 11 engages stub 15 (FIG. 9).

As is apparent from FIGS. 8 and 10, the sliding shutters 93 are slidably mounted on a pair of horizontal, spaced-apart columns 99, with washers 101 at the outer ends of the columns, and screws 103. Fixed to the support end by.

As is apparent from FIGS. 8 and 10, the pivotal shutter 91 is attached to a pair of pivot links 105 which include a mounting bracket 107 and rollers 109. Shutter 91 includes a hole 111 that allows the shutter to be attached to bracket 107 by any suitable means, such as rivets 113. The bracket 107 is pivotally attached to the pivot pin 115 and the roller 109 is similarly attached to the pivot pin 115. The roller penetrates the hole 117 (FIG. 7) and engages the surface of the sliding shutter 93 near the pivotal shutter 91. Pivot link 1
The inner end of 05 is pivotally attached to the frame via a pivot pin 119. Wire spring 121 is link 1
Biasing 05 in the direction opposite to the hour hand about the pin 119 causes the shutters 91, 93 to be held in pressure contact with the washer 101 provided at the left end of the column 99.
The column is arranged between the pair of upper and lower stubs 15 and 17, and is fixed to the frame member attached to the rear wall 19.

When pressure is applied to the sliding shutter 93, the shutter 93 presses the roller 109 that contacts the shutter 93 through the opening 117 of the shutter 91, and as a result, the link 10
5 rotates in the hour hand direction around the pivot pin 119. As a result, the shutter 91 moves laterally and rearward until the hole 95 is aligned with the opening 97 and the stubs 15,17. When the shutter occupies the position shown in FIG. 8, the pillar 99 is moved through the slots 123 and 125 (FIG. 10) to the shutter 9
Support 1. As the shutter 91 moves to the position shown in FIG. 10, the slot 123 slides along the support 99, and the slot 125 moves to the left to come out of contact with the support 99. As a result, the shutter is in the retracted position. (9th
Move to (Fig.).

In the present invention, in order to prevent the barrier 89 from retracting, the stub 1
Means 127 (FIG. 8) are provided which include a block 129 located in the path of movement of the shutter 91 as it traverses 5.
This block is attached to a column 131, and is held in pressure contact with a flanged screw 135 by a coil spring 133. As is apparent from FIG. 10, a slot 137 is formed in the block 129, and even if the block 129 moves back and forth, the guide pin 139 occupies an upright position in the slot 137 to move the shutter 91 laterally. Block.

Thus, when the circuit breaker 7 is in the withdrawn position (FIG. 3) and / or in a position where it has been completely removed from the front of the cell 9, the barrier is a stub
Prevent contact with 5,17. In other words, even if pressure is applied to the barrier 89 during maintenance work, the blocking means 127 prevents the shutter 91 from moving laterally, so the barrier does not retract.

When the circuit breaker 7 enters the connection position of FIG. 1, the trigger means including the protrusion 141 protruding from the front portion of the plurality of terminals 11, 13 comes into contact with the block 129 (FIG. 8,
(FIG. 10) By retracting the block against the spring 133, the block as an obstacle in the movement path of the pivotal shutter 91 is eliminated. Next, when the terminals 11 and 13 face the sliding shutter 93, the shutter 93 retracts and comes into contact with the shutter 91 and the roller 109, and the roller 109 moves against the spring 121, whereby the shutter 91,
93 holes and openings are aligned so that the fixed stubs 15, 17
Is inserted through and is brought into contact with the terminals 11 and 13.

On the contrary, when the circuit breaker 7 is separated from the stubs 15 and 17, the barrier 89 returns to the protective position shown in FIG. 8 under the action of the wire spring 121, and the block 129 moves to the eighth position under the action of the spring 133.
Come to the position shown.

Therefore, the shutter mechanism is inadvertently stub 1
Provide a safety structure to prevent contact with 5,17.

[Brief description of drawings]

1 shows the switchgear of the invention with the detachable unit completely housed in a cubicle or cell associated with it. FIG. 1A shows the circuit breaker in an intermediate or test position. 2 is a side view similar to FIG. 1, FIG. 2 is a side view similar to FIG. 1, showing the detachable unit partially pulled out from the cubicle or cell, and FIG. 3 is the detachable unit operation of FIG. A side view similar to FIG. 2 shown in a state of being completely pulled out from the position and supported by a telescopic track, FIG. 4 is a side view of the frame and the track, FIG.
Fig. 4 is a cross-sectional view taken along the line VV in Fig. 4, and Fig. 6 is VI in Fig. 4.
-VI end view, FIG. 7 is an elevational view of the pivoting shutter, FIG. 8 is an enlarged partial view shown in line VIII-VIII of FIG. 1 with the breaker retracted from the stub. 9
The figure is an enlarged partial view similar to FIG. 8 showing the circuit breaker in the fully connected position, and FIG. 10 is a sectional view showing a pair of shutters aligned with each other in the fully connected position of FIG. 5 ... Switchgear 7 ... Circuit breaker 9 ... Cell 11, 13 ... Movable terminal 15, 17 ... Fixed terminal stub 89 ... Barrier 91, 93 ... Shutter

Claims (3)

[Claims] 1. A cell, a plurality of fixed terminal stubs disposed in the cell for keeping a distance from each other, and terminal means removably disposed in the cell for releasably engaging with the terminal stub when the cell enters and leaves the cell. An opening and closing unit including the opening and closing unit; a barrier made of an electrically insulating material including a first shutter having opening means for receiving the stub; and a first shutter for lateral movement between an unaligned position and an aligned position of the opening means with respect to the stub. The unit comprises a support means including a link that is attached and biased to an unaligned position, and a blocking means that is retractably provided in the shutter moving passage to prevent movement of the shutter from the unaligned position. Allows the opening means to be aligned with the stub by releasing the blocking means so as to retract the blocking means from the shutter movement path upon entry into the Together, they include triggering means for enabling connection of the terminal means and corresponding stubs, said barrier further comprising a second shutter near the first shutter and having a hole aligned with the stub, said second shutter comprising: A roller unit penetrating an opening means provided in the first shutter, the unit being a cell that is biased in a direction away from the stub and is arranged on a side of the first shutter farther from the stub. As the unit retracts the second shutter and the first shutter laterally as it enters the roller shutter means so that the opening means is aligned with the stub to expose the stub to the terminal means. A switchgear characterized by rolling contact with. 2. The opening / closing device according to claim 1, wherein the blocking means is biased toward the shutter moving passage. 3. A second connector is provided on one of the cell and the unit, and a second connector terminal is provided on the other, and one of the second connector and the second connector terminal is a terminal when the unit enters the cell. The stub and the terminal means are flexibly attached so that they can be connected before they are connected, and the shutter for connecting the second connector and the second connector terminal is arranged in a non-aligned position. The switchgear according to item 1 of the above.